It is getting very scary IMHO. Remember the huge SARS outbreak of 2002-2003. This one has already infected more total people and almost matched the countries impacted total in a month. It has not matched the death total but I don't think the numbers, especially deaths are caught up. They blockaded roads to 30 million people and have bodies in the street.
Does not seem to be slowing down and really it is too late to put controls in place with all the air travel that has taken place since late December. The math is scary. They estimated the Spanish Flu impacted 1/3 of the world population in a time before air travel and really even car travel. But if you use that as a conservative analogy and assume the 2.1% death rate is about right that there is potential for 2.5 billion cases and 52,500,000 deaths. Interestingly your more advanced nations may have larger outbreaks that offset better medical treatments. The Spanish Flu hit 40% of the US they say. But if you keep it at 1/3 of the US 330,000,000 population and use a low 1ish percent mortality rate you are talking 3-4 million deaths here. 5 million at 1.4 percent. 7 million at 2.1%. And heaven help us if they are under reporting deaths...
Almost every family has a close relative killed by the Spanish Flu. My grandmothers sister died from it at age 9.